JP6538020B2 - Chair backrest height adjustment structure - Google Patents

Description

  The present invention relates to a chair suitably used for office work, and in particular to a height adjustment structure of its backrest.

Heretofore, in chairs, those capable of changing the height of the backrest have been proposed (see, for example, Patent Documents 1 and 2).
Among them, in the chair of the system in which the backrest is disposed between the left and right back support and fixed to the support with a screw, a plurality of sets of screw insertion holes for the support are provided The height of the backrest is changed by changing the insertion height position of the screw, and this method is often used for a wooden desk of a learning desk.

  Further, Patent Document 2 describes a rocking chair in which a backrest is slidably mounted on a frame which is connected to a base so as to be able to tilt rearward.

  By the way, although a chair for office work usually attaches the backrest to a backrest support extended from the chair body, in such a chair for office work, the height of the backrest can be changed In addition, it is difficult to adopt the method described in Patent Document 1 because of mechanical and design reasons, and the method described in Patent Document 2 must adopt a special backrest support structure Therefore, it was lacking in generality.

  In order to cope with this, it has been proposed that the height of the backrest can be changed by changing the engagement position between the backrest and the backrest support (see Patent Document 3), but the user is aware. It was not possible to easily change the height of the backrest.

JP 2007-75533 A Japanese Patent Publication No. 2003-534876 JP, 2016-135412, A

  In view of the problems with the above-described conventional chair, the present invention allows the user to easily change the height of the backrest in the chair in which the backrest is attached to the backrest support extended from the chair body. An object of the present invention is to provide a backrest height adjustment structure for a chair.

  In order to achieve the above object, the backrest height adjustment structure of a chair of the present invention is a backrest height adjustment structure of a chair in which the backrest is attached to a backrest support extending from a chair body. A plurality of stages of engaging portions are formed at the upper and lower sides of the portion of the backrest support that supports the lower widthwise center portion, and an engaging portion selectively engaged with the engaging portions is formed at the lower portion of the backrest. A pinching portion provided with a roller member is formed on a portion of the backrest support that is movably provided through the operation portion and supports both widthwise ends of the middle portion of the backrest, and pinched to the pinching portion at the middle portion of the backrest It is characterized in that a sliding contact portion which slides in a fixed state is provided.

  In this case, the plurality of engagement portions may be formed of a recess, and the engagement portion engaged with the recess may be formed of a pin member.

  Further, the sliding contact portion may be provided with a ridge extending in the vertical direction in sliding contact with the surface of the opposing member of the roller member of the holding portion.

  In addition, a pervic lumbar support member may be provided on the backrest for supporting the seated person's pelvis from his / her waist so that the shape of the protrusion projecting forward can be varied.

  Further, the pervic lumbar support member may be made of a synthetic resin plate-like member having a thickness of 2 to 4 mm.

  According to the backrest height adjustment structure of the chair of the present invention, in the chair backrest height adjustment structure in which the backrest is attached to the backrest support extending from the chair body, the width direction of the lower part of the backrest A plurality of upper and lower engagement portions are formed at the portion of the backrest support that supports the central portion, and an engagement portion selectively engaged with the engagement portion is formed at the lower portion of the backrest via the operation portion. A pinching portion provided with a roller member is provided on a portion of the backrest support which is movably provided and supports both widthwise end portions of the middle portion of the backrest, and the pinching portion is held in the pinching portion at the middle portion of the backrest. In a chair in which the backrest is attached to a backrest support extended from the chair main body by providing a movable sliding contact portion, the height of the backrest can be easily changed simply by the user operating the operation portion To do Kill.

  In addition, the structure of the engaging portion can be simplified by forming the engaging portions of the plurality of stages as concave portions and making the engaging portions engaged with the concave portions be pin members. .

  In addition, the sliding resistance at the time of adjusting the height of the backrest can be improved by providing the sliding contact portion with a ridge extending in the vertical direction in sliding contact with the surface of the opposing member of the roller member of the holding portion. It can be made smaller.

  Further, the stability of the posture of the seated person can be enhanced by providing the backrest with a pervic lumbar support member for supporting the seated person from the pelvis to the waist so as to make the shape of forward projection variable. Can.

  In addition, the pervic lumbar support member is made of a synthetic resin plate-like member having a thickness of 2 to 4 mm, thereby providing the pervic lumbar support member with a certain degree of flexibility, and various seat occupants It can be adapted to the posture.

An example of a chair which applied height adjustment structure of a backrest of a chair of the present invention is shown, (a) is a front view, (b) is a rear view, (c) is a right side view. The backrest support body and backrest of the same chair are shown, (a) is a perspective view seen from the front side, (b) is a perspective view seen from the rear side. It is the schematic longitudinal cross-sectional view seen from the left side which shows the backrest support body and backrest of the same chair. It is the detailed longitudinal cross-sectional view seen from the right side which shows the backrest support body and backrest of the same chair. It is the detail perspective view seen from the front which shows the backrest support of the same chair, and the lower part of the backrest. It is the detailed perspective view seen from the back which shows the backrest support of the same chair, and the lower part of the backrest. It is the detail perspective view seen from the front which shows the backrest support of the same chair, and the upper part of the backrest. An example of the backrest of the chair is shown, (a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a right side view, (e) is a left side view, (f) ) Is a rear view, (g) is a perspective view from the upper side of the oblique rear side, (h) is a perspective view from the upper side of the oblique front side, (i) is a small projecting shape of the Bic lumbar support member to the front The longitudinal cross-sectional view of the set state, (j) is a longitudinal cross-sectional view of the state which set the protrusion shape to the front of the big lumbar support member large. It is an explanatory view showing the support state of the seating person in the chair.

  Hereinafter, an embodiment of a height adjustment structure of a backrest of a chair of the present invention will be described based on the drawings.

1 to 9 show an embodiment of a chair to which the height adjustment structure for the backrest of the chair of the present invention is applied.
The chair 1 is suitably used for office work, and the backrest 4 in which the sheet member 6 is stretched on the frame member 5 is attached to be able to move up and down to the backrest support 3 extended from the chair main body 2 ing.

  In the chair main body 2, a seat member 7 made of a foamed resin molded body whose outer surface is covered with a sheet material such as cloth is placed on a rigid base seat.

  Further, in the chair 1 of the present embodiment, in order to make it possible to adjust the height of the backrest 4 relative to the backrest support 3 extended from the chair main body 2, the lower part and the middle part of the backrest 4 (backrest support 3 Backrest height adjustment mechanisms 8 and 9 are provided in the middle and upper part of

  Among them, the height adjustment mechanism 8 for the backrest provided at the lower part of the backrest 4 (middle part of the backrest support 3) is the part of the backrest support 3 supporting the central part in the width direction of the lower part of the backrest 4. An engaging portion which is formed with a plurality of stages (five stages in the present embodiment) of upper and lower portions and which is selectively engaged with the engaging portion 81 under the frame member 5 of the backrest 4 82 is movably provided via the operation unit 85.

Here, the multistage engaging portions 81 formed on the backrest support 3 are made to be concave portions, and the engaging portions 82 to be engaged with the concave portions are made to be pin members.
Thereby, the structure of the engaging parts 81 and 82 can be simply configured.
Then, the engaging portion 82 formed of a pin member is urged by the spring 83 to engage the engaging portion 81 formed of the recess, and the operation portion 85 is operated to operate the operation piece 84. The engaging portion 82 formed of a pin member is disengaged from the engaging portion 81 formed of a recess against the biasing force of the spring 83 so that the other engaging portion 81 can be selectively engaged. .

  The height adjustment mechanism 9 for the backrest provided at the middle part of the backrest 4 (upper part of the backrest support 3) is a part of the backrest support 3 that supports both widthwise ends of the middle part of the backrest 4. A sandwiching portion 91 including a roller member 92 is formed, and a sliding contact portion 93 which slides in a state of being sandwiched by the sandwiching portion 91 is provided in the middle portion of the frame member 5 of the backrest 4.

Here, the sliding contact portion 93 is provided with a ridge 94 extending in the vertical direction in sliding contact with the surface of the opposing member of the roller member 92 of the holding portion 91.
Thereby, the sliding resistance at the time of height adjustment of the backrest 4 can be made small.

  As described above, according to the chair 1 of the present embodiment, in a chair in which the backrest 4 is attached to the backrest support 3 extended from the chair main body 2, the user only operates the operation unit 85, The height of the backrest 4 can be easily changed.

By the way, in the chair of the present embodiment, as shown in FIGS. 8 to 9, the shape of the forward projection of the pervic lumbar support member 41 supported from the pelvis to the waist of the seated person can be changed to the backrest 4. It is made to provide it.
Here, since the backrest 4 has a structure in which the sheet member 6 is stretched on the frame member 5, the backrest 4 is supported from the back of the sheet member 6 by the pervic lumbar support member 41 from the pelvis to the waist of the seated person There is.

The pervic lumbar support member 41 is composed of a T-shaped synthetic resin plate member having a thickness of 2 to 4 mm and having a certain degree of flexibility, and both sides of the upper portion are the middle of the frame member 5 of the backrest 4 Pelvic by selectively fitting in the lower part of the frame member 5 of the backrest 4 in the upper part and the lower part in the upper and lower two stages, respectively. The lumbar support member 41 can be mounted in a forwardly curved projecting state.
Here, the lower part of the pervic lumbar support member 41 is formed by forming the fitting parts 51 and 52 formed in upper and lower two stages so that the fitting part 52 lower than the upper fitting part 51 is positioned forward. As shown in FIG. 8 (i), when the upper fitting portion 51 is inserted, the shape of the forward projection is set small, and as shown in FIG. 8 (j), In the case of fitting into the fitting portion 52, the shape of the forward protrusion is set to be large.
In addition, by attaching the backrest 4 to the backrest support 3 extended from the chair main body so as to be capable of moving up and down, the pervic lumbar support member 41 can be positioned at a height adapted to the seated person.
As a result, it is possible to make the pervic lumbar support member 41 have a certain degree of flexibility, to be able to conform to various postures of the seated person, and to improve the stability of the seated person's posture.

  Thus, in the chair of the present embodiment, as shown in FIG. 9, in addition to supporting the weight of the seated person in the vicinity of the ischial node by the seat member 7, the pervic lumbar support member 41 It can be supported from the pelvis to the hip of the seated person, and the stability of the seated person's posture can be enhanced.

  As mentioned above, although the height adjustment structure of the backrest of the chair of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, In the range which does not deviate from the meaning The configuration can be changed as appropriate.

  The backrest height adjustment structure of the chair of the present invention allows the user to easily change the height of the backrest in a chair in which the backrest is attached to a backrest support extended from the chair body. It can be suitably used for office chair use, and can be widely used for various chair uses.

DESCRIPTION OF SYMBOLS 1 chair 2 chair main body 3 back support 4 backrest 41 pervic lumbar support member 5 frame member 6 seat member 7 seat member 8 backrest height adjustment mechanism 81 engagement portion 82 engagement portion 83 spring 84 operation piece 85 operation portion 9 Backrest height adjustment mechanism 91 Clamping part 92 Roller member 93 Sliding contact part 94 Projection

Claims (5)

  In the height adjustment structure of a backrest of a chair for attaching a backrest to a backrest support extending from a chair body, a plurality of steps up and down at a portion of the backrest support supporting a widthwise center of a lower portion of the backrest In the lower part of the backrest, an engagement part selectively engaged with the engagement part is movably provided via the operation part, and both ends of the middle part of the backrest in the width direction are formed. A chair characterized in that a holding portion provided with a roller member is formed at a portion of a backrest support to be supported, and a sliding contact portion which slides in a state of being held by the holding portion is provided at an intermediate portion of the backrest. Backrest height adjustment structure.   The chair backrest height adjustment structure according to claim 1, wherein the plurality of engagement portions are formed of a recess, and the engagement portion engaged with the recess is formed of a pin member.   The height adjustment structure for the backrest of a chair according to claim 1 or 2, wherein the sliding contact portion includes a ridge extending in the vertical direction in sliding contact with the surface of the opposing member of the roller member of the holding portion. .   4. The chair according to claim 1, 2 or 3, wherein a pervic lumbar support member for supporting the seat back from the pelvis to the waist of the seated person is provided so as to have a variable forward projecting shape. Backrest height adjustment structure.   5. The backrest height adjustment structure of a chair according to claim 4, wherein the pervic lumbar support member is made of a synthetic resin plate-like member having a thickness of 2 to 4 mm.

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